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Date: Mon, 14 Nov 2016 00:14:20 +0000 From: Ben Hutchings <ben@...adent.org.uk> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org CC: akpm@...ux-foundation.org, "Peter Rosin" <peda@...ntia.se>, "Wolfram Sang" <wsa@...-dreams.de> Subject: [PATCH 3.16 314/346] i2c: mux: pca954x: retry updating the mux selection on failure 3.16.39-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Peter Rosin <peda@...ntia.se> commit 463e8f845cbf1c01e4cc8aeef1703212991d8e1e upstream. The cached value of the last selected channel prevents retries on the next call, even on failure to update the selected channel. Fix that. Signed-off-by: Peter Rosin <peda@...ntia.se> Signed-off-by: Wolfram Sang <wsa@...-dreams.de> [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings <ben@...adent.org.uk> --- drivers/i2c/muxes/i2c-mux-pca954x.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/i2c/muxes/i2c-mux-pca954x.c +++ b/drivers/i2c/muxes/i2c-mux-pca954x.c @@ -161,7 +161,7 @@ static int pca954x_select_chan(struct i2 /* Only select the channel if its different from the last channel */ if (data->last_chan != regval) { ret = pca954x_reg_write(adap, client, regval); - data->last_chan = regval; + data->last_chan = ret ? 0 : regval; } return ret;
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